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Published online by Cambridge University Press: 07 November 2014

page 241 note *  Since the integrand 
the definite intergal 
 is tabulated in two parts exculding x=0; vz. Ei(x)=
and 
 the latter is always -ve and →0 as x→∞.
page 242 note † The meaning of the double signs ± and ∓ is, as usual, that the upper sign is to be used throughout in one case, and the lower sign throughout in the other case.